Ijima, I. 1903. Studies on the Hexactinellida. Contribution III. (Placosoma, a New Euplectellid; Leucopsacidae and Caulophacidae). Journal of the College of Sciences, Imperial University of Tokyo 18(1): 1-124, pls I-VIII. [details]

original description Ijima, I. 1903. Studies on the Hexactinellida. Contribution III. (Placosoma, a New Euplectellid; Leucopsacidae and Caulophacidae). Journal of the College of Sciences, Imperial University of Tokyo 18(1): 1-124, pls I-VIII. [details]